将C#Owin响应类型从代码更改为令牌

我正在尝试使用OWIN外部登录到Google/Facebook

面临的问题是owin挑战不断将响应类型从令牌更改为代码

质询生成以下URL：

这将从google返回一个错误。如果我将response\u type更改为token（response\u type=token），它会工作

下面是OAuth选项

 OAuthOptions = new OAuthAuthorizationServerOptions
        {

            TokenEndpointPath = new PathString("/Token"),
            Provider = new ApplicationOAuthProvider(PublicClientId),
            AuthorizeEndpointPath = new PathString("/api/Account/ExternalLogin"),
            AccessTokenExpireTimeSpan = TimeSpan.FromDays(14),

            // In production mode set AllowInsecureHttp = false
            AllowInsecureHttp = true,


        };

Google中间件设置：

 app.UseGoogleAuthentication(new GoogleOAuth2AuthenticationOptions()
        {
            ClientId = "clientid",
            ClientSecret = "client secret",  
        }); 

以下是挑战：

   var properties = new AuthenticationProperties() {   AllowRefresh = true, RedirectUri="mywebsite.co.za"  };


        Request.GetOwinContext().Authentication.Challenge(properties,LoginProvider);

        HttpResponseMessage response = new HttpResponseMessage(HttpStatusCode.Unauthorized);
        response.RequestMessage = Request;
        return Task.FromResult(response);

---

OWIN是通用MVC API项目的基本设置。

将响应类型重写为令牌的解决方案如下：

 GoogleOAuth2AuthenticationOptions googleOAuth2AuthenticationOptions = new GoogleOAuth2AuthenticationOptions
        {
            ClientId = "clientid",
            ClientSecret = "secret",

            Provider = new GoogleOAuth2AuthenticationProvider
            {
                OnApplyRedirect = context =>
                {
                    string redirect = context.RedirectUri.Replace("response_type=code", "response_type=token");
                    context.Response.Redirect(redirect);
                },

            },
        };

        app.UseGoogleAuthentication(googleOAuth2AuthenticationOptions);

它仍然回避了一个问题，如果googleoauth2.0需要response_type=token，那么Owin.google提供者为什么要使用response_type=code呢